projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| da7c5cc6 | 1 | /* |
| 0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| da7c5cc6 KM |
3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| 10deb49e | 6 | * @(#)ffs_tables.c 7.2 (Berkeley) %G% |
| da7c5cc6 | 7 | */ |
| 5576d804 | 8 | |
| 10deb49e | 9 | #ifdef KERNEL |
| 94368568 | 10 | #include "param.h" |
| 10deb49e KB |
11 | #else |
| 12 | #include <sys/param.h> | |
| 13 | #endif | |
| 5576d804 | 14 | |
| 5576d804 | 15 | /* |
| 88a7a62a | 16 | * Bit patterns for identifying fragments in the block map |
| 5576d804 KM |
17 | * used as ((map & around) == inside) |
| 18 | */ | |
| 19 | int around[9] = { | |
| 20 | 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff | |
| 21 | }; | |
| 22 | int inside[9] = { | |
| 23 | 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe | |
| 24 | }; | |
| 25 | ||
| 26 | /* | |
| 88a7a62a | 27 | * Given a block map bit pattern, the frag tables tell whether a |
| 5576d804 | 28 | * particular size fragment is available. |
| b6407c9d | 29 | * |
| 5576d804 | 30 | * used as: |
| b6407c9d | 31 | * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] { |
| 5576d804 KM |
32 | * at least one fragment of the indicated size is available |
| 33 | * } | |
| b6407c9d KM |
34 | * |
| 35 | * These tables are used by the scanc instruction on the VAX to | |
| 5576d804 KM |
36 | * quickly find an appropriate fragment. |
| 37 | */ | |
| 88a7a62a | 38 | u_char fragtbl124[256] = { |
| 156b8f82 KM |
39 | 0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e, |
| 40 | 0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a, | |
| 41 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 42 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 43 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 44 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 45 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, | |
| 46 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, | |
| 47 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 48 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 49 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 50 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 51 | 0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e, | |
| 52 | 0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae, | |
| 53 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, | |
| 54 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, | |
| 55 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 56 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 57 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 58 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 59 | 0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e, | |
| 60 | 0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e, | |
| 61 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, | |
| 62 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, | |
| 63 | 0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e, | |
| 64 | 0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa, | |
| 65 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, | |
| 66 | 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe, | |
| 67 | 0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e, | |
| 68 | 0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce, | |
| 69 | 0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce, | |
| 70 | 0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a, | |
| 5576d804 | 71 | }; |
| 5576d804 | 72 | |
| 88a7a62a | 73 | u_char fragtbl8[256] = { |
| 5576d804 KM |
74 | 0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04, |
| 75 | 0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08, | |
| 76 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 77 | 0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10, | |
| 78 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 79 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 80 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
| 81 | 0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20, | |
| 82 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 83 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 84 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 85 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
| 86 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
| 87 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, | |
| 88 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, | |
| 89 | 0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40, | |
| 90 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 91 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 92 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 93 | 0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11, | |
| 94 | 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05, | |
| 95 | 0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09, | |
| 96 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, | |
| 97 | 0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21, | |
| 98 | 0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06, | |
| 99 | 0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a, | |
| 100 | 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07, | |
| 101 | 0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12, | |
| 102 | 0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04, | |
| 103 | 0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c, | |
| 104 | 0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c, | |
| 105 | 0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80, | |
| 106 | }; | |
| b6407c9d KM |
107 | |
| 108 | /* | |
| 88a7a62a | 109 | * The actual fragtbl array. |
| b6407c9d | 110 | */ |
| 88a7a62a | 111 | u_char *fragtbl[MAXFRAG + 1] = { |
| 156b8f82 | 112 | 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8, |
| b6407c9d | 113 | }; |